Unit 5 Computer Science Practice Test

1. What is the primary purpose of dividing data into packets for transmission over the internet?

• A) To ensure the data is encrypted.
  

• B) To minimize the size of each data chunk.
  

• C) To facilitate error detection and correction.
  

• D) To allow the data to travel through different routes and avoid congestion.

2. Which layer of the OSI model is responsible for packet forwarding and routing?

• A) Application Layer

• B) Network Layer

• C) Transport Layer

• D) Data Link Layer

3. Which protocol is responsible for ensuring reliable delivery of packets by providing acknowledgments and retransmissions?

• A) UDP

• B) IP

• C) TCP

• D) ARP

4. In an IP packet, which field is used to specify the destination address of the packet?

• A) Protocol
  

• B) Source IP Address

• C) Destination IP Address

• D) Sequence Number

8. Which of the following is true about UDP (User Datagram Protocol)?

• A) It guarantees packet delivery.

• B) It ensures the order of packet arrival.

• C) It is a connectionless protocol.

• D) It performs error correction.

11. Which of the following is true about packet switching?

• A) It requires a dedicated communication path for the entire duration of the transmission.

• B) It splits data into small packets, which may take different paths to reach the destination.

• C) It is used only for telephone calls, not data transmission.

• D) It is a method used in circuit-switched networks.

15. Which of the following describes a situation where a packet is "fragmented"?

• A) The packet is sent in multiple copies.

• B) The packet is broken into smaller pieces because it exceeds the network’s MTU.

• C) The packet is compressed to save bandwidth.
  

• D) The packet is encrypted to ensure security.

1. Which of the following is the main goal of fault tolerance in a system?

• A) To improve system performance by reducing processing time.

• B) To ensure the system continues to operate despite hardware or software failures.

• C) To make systems more cost-efficient by using fewer resources.

• D) To prevent the system from ever experiencing any failure.

11. In a fault-tolerant network, what does load balancing help achieve?

• A) It isolates network components to prevent faults.

• B) It ensures that all traffic is directed through a single network path.

• C) It distributes network traffic evenly across multiple servers or resources to prevent overloading.

• D) It minimizes the need for backups.

Type of cyberattack where multiple compromised computers or devices are used to flood a target (typically a server, service, or network) with a massive amount of traffic, overwhelming its resources and causing it to become slow, unavailable, or completely unresponsive.

• Phishing

• Virus

• DDOS

• Hacking